Exploring Sea Water Pump Options: Top Manufacturers and Industry Insights Transporting and circulating saltwater is one of the many uses for seawater pumps on a ship. Ballast transfer, bilge pumping, fire-fighting, and high-pressure deck cleaning are just a few of the many potential applications for a Sea Water Pump. There are numerous other possible applications as well. Seawater pumps are used in cooling systems, desalination facilities, and the maritime industry to handle brine and saltwater, two very aggressive fluids.